; This must be the *first* file on the linker command line
;
- .export _exit, __Exit
- .import initlib, donelib
- .import zerobss
- .import __STARTUP_LOAD__, __BSS_LOAD__ ; Linker generated
- .import callmain
+ .export _exit, __Exit
+ .import zerobss
+ .import initlib, donelib
+ .import callmain, callirq
+ .import __STARTUP_LOAD__, __BSS_LOAD__ ; Linker generated
+ .import __INTERRUPTOR_COUNT__ ; Linker generated
.include "zeropage.inc"
- .include "apple2.inc"
+ .include "apple2.inc"
+ .include "mli.inc"
; ------------------------------------------------------------------------
-; The executable header
-.segment "EXEHDR"
+ .segment "EXEHDR"
- .word __STARTUP_LOAD__ ; Start address
- .word __BSS_LOAD__ - __STARTUP_LOAD__ ; Size
+ .addr __STARTUP_LOAD__ ; Start address
+ .word __BSS_LOAD__ - __STARTUP_LOAD__ ; Size
; ------------------------------------------------------------------------
-; Place the startup code in a special segment.
-.segment "STARTUP"
+ .segment "STARTUP"
+
+ ; ProDOS TechRefMan, chapter 5.2.1:
+ ; "For maximum interrupt efficiency, a system program should not
+ ; use more than the upper 3/4 of the stack."
+ ldx #$FF
+ txs ; Init stack pointer
+
+ ; Delegate all further processing to keep STARTUP small
+ jsr init
+
+ ; Avoid re-entrance of donelib. This is also the _exit entry
+_exit: ldx #<__Exit
+ lda #>__Exit
+ jsr reset ; Setup RESET vector
+
+ ; Check for valid interrrupt vector table entry number
+ lda intnum
+ beq :+
+
+ ; Deallocate interrupt vector table entry
+ dec params ; Adjust parameter count
+ jsr ENTRY
+ .byte $41 ; Dealloc interrupt
+ .addr params
+
+ ; Call module destructors
+: jsr donelib
+
+ ; Restore the original RESET vector. This is also the __Exit entry
+__Exit: ldx #$02
+: lda rvsave,x
+ sta SOFTEV,x
+ dex
+ bpl :-
+
+ ; Copy back the zero page stuff
+ ldx #zpspace-1
+: lda zpsave,x
+ sta sp,x
+ dex
+ bpl :-
+
+ ; ProDOS TechRefMan, chapter 5.2.1:
+ ; "System programs should set the stack pointer to $FF at the
+ ; warm-start entry point."
+ ldx #$FF
+ txs ; Re-init stack pointer
+
+ ; Back to DOS
+ jmp DOSWARM
-; ProDOS TechRefMan, chapter 5.2.1:
-; "For maximum interrupt efficiency, a system program should not use more
-; than the upper 3/4 of the stack."
-
- ldx #$FF
- txs ; Init stack pointer
-
-; Save the zero page locations we need
-
- ldx #zpspace-1
-: lda sp,x
- sta zpsave,x
- dex
- bpl :-
-
-; Save the original RESET vector
-
- ldx #$02
-: lda SOFTEV,x
- sta rvsave,x
- dex
- bpl :-
-
-; ProDOS TechRefMan, chapter 5.3.5:
-; "Your system program should place in the RESET vector the address of a
-; routine that ... closes the files."
-
- ldx #<_exit
- lda #>_exit
- jsr reset ; Setup RESET vector
-
-; Clear the BSS data
-
- jsr zerobss
-
-; Setup the stack
-
- lda HIMEM
- sta sp
- lda HIMEM+1
- sta sp+1 ; Set argument stack ptr
-
-; Call module constructors
-
- jsr initlib
-
-; Push arguments and call main()
-
- jsr callmain
-
-; Avoid re-entrance of donelib. This is also the _exit entry
-
-_exit: ldx #<__Exit
- lda #>__Exit
- jsr reset ; Setup RESET vector
-
-; Call module destructors
+; ------------------------------------------------------------------------
- jsr donelib
+ .segment "INIT"
+
+ ; Save the zero page locations we need
+init: ldx #zpspace-1
+: lda sp,x
+ sta zpsave,x
+ dex
+ bpl :-
+
+ ; Save the original RESET vector
+ ldx #$02
+: lda SOFTEV,x
+ sta rvsave,x
+ dex
+ bpl :-
+
+ ; ProDOS TechRefMan, chapter 5.3.5:
+ ; "Your system program should place in the RESET vector the
+ ; address of a routine that ... closes the files."
+ ldx #<_exit
+ lda #>_exit
+ jsr reset ; Setup RESET vector
+
+ ; Clear the BSS data
+ jsr zerobss
+
+ ; Setup the stack
+ lda HIMEM
+ sta sp
+ lda HIMEM+1
+ sta sp+1 ; Set argument stack ptr
+
+ ; Call module constructors
+ jsr initlib
+
+ ; Check for interruptors
+ lda #<__INTERRUPTOR_COUNT__
+ beq :+
+
+ ; Check for ProDOS
+ lda ENTRY
+ cmp #$4C ; Is MLI present? (JMP opcode)
+ bne :+
+
+ ; Allocate interrupt vector table entry
+ jsr ENTRY
+ .byte $40 ; Alloc interrupt
+ .addr params
+
+ ; Push arguments and call main()
+: jmp callmain
-; Restore the original RESET vector. This is also the __Exit entry
+; ------------------------------------------------------------------------
-__Exit: ldx #$02
-: lda rvsave,x
- sta SOFTEV,x
- dex
- bpl :-
+ .segment "LOWCODE"
-; Copy back the zero page stuff
+ ; ProDOS TechRefMan, chapter 6.2:
+ ; "Each installed routine must begin with a CLD instruction"
+intrpt: cld
- ldx #zpspace-1
-: lda zpsave,x
- sta sp,x
- dex
- bpl :-
+ ; Call interruptors
+ jsr callirq
-; ProDOS TechRefMan, chapter 5.2.1:
-; "System programs should set the stack pointer to $FF at the warm-start
-; entry point."
+ ; ProDOS TechRefMan, chapter 6.2:
+ ; "When the routine that can process the interrupt is called, it
+ ; should ... return (via an RTS) with the carry flag clear."
+ clc
+ rts
- ldx #$FF
- txs ; Re-init stack pointer
+; ------------------------------------------------------------------------
-; Back to DOS
+ .code
- jmp DOSWARM
+ ; Setup RESET vector
+reset: stx SOFTEV
+ sta SOFTEV+1
+ eor #$A5
+ sta PWREDUP
+ rts
; ------------------------------------------------------------------------
-; Setup RESET vector
-reset: stx SOFTEV
- sta SOFTEV+1
- eor #$A5
- sta PWREDUP
- rts
-
-; ------------------------------------------------------------------------
-; Data
+ .data
-.data
+zpsave: .res zpspace
-zpsave: .res zpspace
+rvsave: .res 3
-rvsave: .res 3
+params: .byte $02 ; Parameter count
+intnum: .byte $00 ; Interrupt number
+ .addr intrpt ; Interrupt handler
projects / cc65 / commitdiff